78251366501 has 32 divisors (see below), whose sum is σ = 97888020480. Its totient is φ = 60770577600.

The previous prime is 78251366483. The next prime is 78251366513. The reversal of 78251366501 is 10566315287.

It is a cyclic number.

It is not a de Polignac number, because 78251366501 - 2¹⁸ = 78251104357 is a prime.

It is a super-2 number, since 2×78251366501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78251306501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41644280 + ... + 41646158.

It is an arithmetic number, because the mean of its divisors is an integer number (3059000640).

Almost surely, 2^78251366501 is an apocalyptic number.

It is an amenable number.

78251366501 is a deficient number, since it is larger than the sum of its proper divisors (19636653979).

78251366501 is a wasteful number, since it uses less digits than its factorization.

78251366501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 78251366501 in words is "seventy-eight billion, two hundred fifty-one million, three hundred sixty-six thousand, five hundred one".