61821126351 has 24 divisors (see below), whose sum is σ = 89463460320. Its totient is φ = 41137419456.

The previous prime is 61821126347. The next prime is 61821126397. The reversal of 61821126351 is 15362112816.

61821126351 is a `hidden beast` number, since 6 + 1 + 8 + 2 + 1 + 12 + 635 + 1 = 666.

It is not a de Polignac number, because 61821126351 - 2² = 61821126347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61821126151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18111721 + ... + 18115133.

It is an arithmetic number, because the mean of its divisors is an integer number (3727644180).

Almost surely, 2^61821126351 is an apocalyptic number.

61821126351 is a deficient number, since it is larger than the sum of its proper divisors (27642333969).

61821126351 is a wasteful number, since it uses less digits than its factorization.

61821126351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6575 (or 6572 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 61821126351 in words is "sixty-one billion, eight hundred twenty-one million, one hundred twenty-six thousand, three hundred fifty-one".