861816631501 has 8 divisors (see below), whose sum is σ = 1036771887680. Its totient is φ = 699821023968.

The previous prime is 861816631493. The next prime is 861816631519. The reversal of 861816631501 is 105136618168.

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

It is not a de Polignac number, because 861816631501 - 2³ = 861816631493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861816631591) 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, 3239912016 + ... + 3239912281.

It is an arithmetic number, because the mean of its divisors is an integer number (129596485960).

Almost surely, 2^861816631501 is an apocalyptic number.

It is an amenable number.

861816631501 is a deficient number, since it is larger than the sum of its proper divisors (174955256179).

861816631501 is a wasteful number, since it uses less digits than its factorization.

861816631501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6479824323.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 861816631501 in words is "eight hundred sixty-one billion, eight hundred sixteen million, six hundred thirty-one thousand, five hundred one".