77631543643870 has 16 divisors (see below), whose sum is σ = 139736919591360. Its totient is φ = 31052586117024.

The previous prime is 77631543643859. The next prime is 77631543643873. The reversal of 77631543643870 is 7834634513677.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77631543643873) 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, 8300539 + ... + 14972041.

It is an arithmetic number, because the mean of its divisors is an integer number (8733557474460).

Almost surely, 2^{77631543643870} is an apocalyptic number.

77631543643870 is a deficient number, since it is larger than the sum of its proper divisors (62105375947490).

77631543643870 is a wasteful number, since it uses less digits than its factorization.

77631543643870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7835139.

The product of its (nonzero) digits is 213373440, while the sum is 64.

The spelling of 77631543643870 in words is "seventy-seven trillion, six hundred thirty-one billion, five hundred forty-three million, six hundred forty-three thousand, eight hundred seventy".