861964371541 has 32 divisors (see below), whose sum is σ = 1077738368000. Its totient is φ = 671196201984.

The previous prime is 861964371533. The next prime is 861964371617. The reversal of 861964371541 is 145173469168.

It is not a de Polignac number, because 861964371541 - 2³ = 861964371533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861964371841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2935585 + ... + 3215833.

It is an arithmetic number, because the mean of its divisors is an integer number (33679324000).

Almost surely, 2^861964371541 is an apocalyptic number.

It is an amenable number.

861964371541 is a deficient number, since it is larger than the sum of its proper divisors (215773996459).

861964371541 is a wasteful number, since it uses less digits than its factorization.

861964371541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280805.

The product of its digits is 4354560, while the sum is 55.

The spelling of 861964371541 in words is "eight hundred sixty-one billion, nine hundred sixty-four million, three hundred seventy-one thousand, five hundred forty-one".