81970964015 has 8 divisors (see below), whose sum is σ = 98414376000. Its totient is φ = 65543958432.

The previous prime is 81970963967. The next prime is 81970964029. The reversal of 81970964015 is 51046907918.

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

It is a cyclic number.

It is not a de Polignac number, because 81970964015 - 2⁶ = 81970963951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4090604 + ... + 4110593.

It is an arithmetic number, because the mean of its divisors is an integer number (12301797000).

Almost surely, 2^81970964015 is an apocalyptic number.

81970964015 is a deficient number, since it is larger than the sum of its proper divisors (16443411985).

81970964015 is a wasteful number, since it uses less digits than its factorization.

81970964015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8203201.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 81970964015 in words is "eighty-one billion, nine hundred seventy million, nine hundred sixty-four thousand, fifteen".