61524593981 has 8 divisors (see below), whose sum is σ = 64322341440. Its totient is φ = 58737076992.

The previous prime is 61524593969. The next prime is 61524593983. The reversal of 61524593981 is 18939542516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61524593981 - 2¹⁰ = 61524592957 is a prime.

It is a super-2 number, since 2×61524593981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61524593983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2545316 + ... + 2569373.

It is an arithmetic number, because the mean of its divisors is an integer number (8040292680).

Almost surely, 2^61524593981 is an apocalyptic number.

It is an amenable number.

61524593981 is a deficient number, since it is larger than the sum of its proper divisors (2797747459).

61524593981 is a wasteful number, since it uses less digits than its factorization.

61524593981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5115235.

The product of its digits is 2332800, while the sum is 53.

The spelling of 61524593981 in words is "sixty-one billion, five hundred twenty-four million, five hundred ninety-three thousand, nine hundred eighty-one".