81252763190 has 8 divisors (see below), whose sum is σ = 146254973760. Its totient is φ = 32501105272.

The previous prime is 81252763183. The next prime is 81252763201. The reversal of 81252763190 is 9136725218.

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

It is a super-2 number, since 2×81252763190² (a number of 23 digits) contains 22 as substring.

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, 4062638150 + ... + 4062638169.

It is an arithmetic number, because the mean of its divisors is an integer number (18281871720).

Almost surely, 2^81252763190 is an apocalyptic number.

81252763190 is a deficient number, since it is larger than the sum of its proper divisors (65002210570).

81252763190 is a wasteful number, since it uses less digits than its factorization.

81252763190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8125276326.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 81252763190 in words is "eighty-one billion, two hundred fifty-two million, seven hundred sixty-three thousand, one hundred ninety".