981661262137 has 8 divisors (see below), whose sum is σ = 1023360705792. Its totient is φ = 940588878000.

The previous prime is 981661262129. The next prime is 981661262173. The reversal of 981661262137 is 731262166189.

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 981661262137 - 2³ = 981661262129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981661262117) 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, 156761683 + ... + 156767944.

It is an arithmetic number, because the mean of its divisors is an integer number (127920088224).

Almost surely, 2^981661262137 is an apocalyptic number.

It is an amenable number.

981661262137 is a deficient number, since it is larger than the sum of its proper divisors (41699443655).

981661262137 is a wasteful number, since it uses less digits than its factorization.

981661262137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313529759.

The product of its digits is 1306368, while the sum is 52.

The spelling of 981661262137 in words is "nine hundred eighty-one billion, six hundred sixty-one million, two hundred sixty-two thousand, one hundred thirty-seven".