73157901981 has 16 divisors (see below), whose sum is σ = 101798010240. Its totient is φ = 46645410240.

The previous prime is 73157901959. The next prime is 73157901989. The reversal of 73157901981 is 18910975137.

It is not a de Polignac number, because 73157901981 - 2⁹ = 73157901469 is a prime.

It is a super-2 number, since 2×73157901981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73157901989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 506451 + ... + 634671.

It is an arithmetic number, because the mean of its divisors is an integer number (6362375640).

Almost surely, 2^73157901981 is an apocalyptic number.

It is an amenable number.

73157901981 is a deficient number, since it is larger than the sum of its proper divisors (28640108259).

73157901981 is a wasteful number, since it uses less digits than its factorization.

73157901981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136516.

The product of its (nonzero) digits is 476280, while the sum is 51.

The spelling of 73157901981 in words is "seventy-three billion, one hundred fifty-seven million, nine hundred one thousand, nine hundred eighty-one".