81630290974 has 8 divisors (see below), whose sum is σ = 129648109248. Its totient is φ = 38414254560.

The previous prime is 81630290939. The next prime is 81630291031. The reversal of 81630290974 is 47909203618.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1200445422 + ... + 1200445489.

It is an arithmetic number, because the mean of its divisors is an integer number (16206013656).

Almost surely, 2^81630290974 is an apocalyptic number.

81630290974 is a deficient number, since it is larger than the sum of its proper divisors (48017818274).

81630290974 is a wasteful number, since it uses less digits than its factorization.

81630290974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400890930.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 81630290974 in words is "eighty-one billion, six hundred thirty million, two hundred ninety thousand, nine hundred seventy-four".