81970695902 has 4 divisors (see below), whose sum is σ = 122956043856. Its totient is φ = 40985347950.

The previous prime is 81970695901. The next prime is 81970695973. The reversal of 81970695902 is 20959607918.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81970695901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20492673974 + ... + 20492673977.

It is an arithmetic number, because the mean of its divisors is an integer number (30739010964).

Almost surely, 2^81970695902 is an apocalyptic number.

81970695902 is a deficient number, since it is larger than the sum of its proper divisors (40985347954).

81970695902 is a wasteful number, since it uses less digits than its factorization.

81970695902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40985347953.

The product of its (nonzero) digits is 2449440, while the sum is 56.

The spelling of 81970695902 in words is "eighty-one billion, nine hundred seventy million, six hundred ninety-five thousand, nine hundred two".