81151683501 has 8 divisors (see below), whose sum is σ = 123659708224. Its totient is φ = 46372390560.

The previous prime is 81151683499. The next prime is 81151683511. The reversal of 81151683501 is 10538615118.

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

It is not a de Polignac number, because 81151683501 - 2¹ = 81151683499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81151683501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81151683511) 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, 1932182920 + ... + 1932182961.

It is an arithmetic number, because the mean of its divisors is an integer number (15457463528).

Almost surely, 2^81151683501 is an apocalyptic number.

It is an amenable number.

81151683501 is a deficient number, since it is larger than the sum of its proper divisors (42508024723).

81151683501 is a wasteful number, since it uses less digits than its factorization.

81151683501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3864365891.

The product of its (nonzero) digits is 28800, while the sum is 39.

The spelling of 81151683501 in words is "eighty-one billion, one hundred fifty-one million, six hundred eighty-three thousand, five hundred one".