616953731385981 has 16 divisors (see below), whose sum is σ = 897408976665600. Its totient is φ = 373902297766320.

The previous prime is 616953731385911. The next prime is 616953731386007. The reversal of 616953731385981 is 189583137359616.

It is a de Polignac number, because none of the positive numbers 2^k-616953731385981 is a prime.

It is a super-2 number, since 2×616953731385981² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616953731385911) 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, 224981205 + ... + 227706938.

It is an arithmetic number, because the mean of its divisors is an integer number (56088061041600).

Almost surely, 2^{616953731385981} is an apocalyptic number.

It is an amenable number.

616953731385981 is a deficient number, since it is larger than the sum of its proper divisors (280455245279619).

616953731385981 is a wasteful number, since it uses less digits than its factorization.

616953731385981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452729456.

The product of its digits is 881798400, while the sum is 75.

The spelling of 616953731385981 in words is "six hundred sixteen trillion, nine hundred fifty-three billion, seven hundred thirty-one million, three hundred eighty-five thousand, nine hundred eighty-one".