7491551397660 has 768 divisors, whose sum is σ = 28194556723200. Its totient is φ = 1650308567040.

The previous prime is 7491551397623. The next prime is 7491551397667. The reversal of 7491551397660 is 667931551947.

It is a happy number.

7491551397660 is a `hidden beast` number, since 7 + 4 + 9 + 1 + 551 + 3 + 9 + 76 + 6 + 0 = 666.

It is a super-2 number, since 2×7491551397660² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7491551397667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 237186229 + ... + 237217811.

It is an arithmetic number, because the mean of its divisors is an integer number (36711662400).

Almost surely, 2^{7491551397660} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7491551397660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14097278361600).

7491551397660 is an abundant number, since it is smaller than the sum of its proper divisors (20703005325540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7491551397660 is a wasteful number, since it uses less digits than its factorization.

7491551397660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31670 (or 31650 counting only the distinct ones).

The product of its (nonzero) digits is 42865200, while the sum is 63.

The spelling of 7491551397660 in words is "seven trillion, four hundred ninety-one billion, five hundred fifty-one million, three hundred ninety-seven thousand, six hundred sixty".