861962650978 has 32 divisors (see below), whose sum is σ = 1554308344512. Its totient is φ = 353251886400.

The previous prime is 861962650951. The next prime is 861962650979. The reversal of 861962650978 is 879056269168.

It is a super-2 number, since 2×861962650978² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861962650979) 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, 35032533 + ... + 35057128.

It is an arithmetic number, because the mean of its divisors is an integer number (48572135766).

Almost surely, 2^861962650978 is an apocalyptic number.

861962650978 is a deficient number, since it is larger than the sum of its proper divisors (692345693534).

861962650978 is a wasteful number, since it uses less digits than its factorization.

861962650978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70089730.

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 861962650978 in words is "eight hundred sixty-one billion, nine hundred sixty-two million, six hundred fifty thousand, nine hundred seventy-eight".