81589650974 has 48 divisors (see below), whose sum is σ = 136172647968. Its totient is φ = 36420560064.

The previous prime is 81589650973. The next prime is 81589650977. The reversal of 81589650974 is 47905698518.

It is a super-2 number, since 2×81589650974² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81589650973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30822119 + ... + 30824765.

It is an arithmetic number, because the mean of its divisors is an integer number (2836930166).

Almost surely, 2^81589650974 is an apocalyptic number.

81589650974 is a deficient number, since it is larger than the sum of its proper divisors (54582996994).

81589650974 is a wasteful number, since it uses less digits than its factorization.

81589650974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057 (or 2878 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 62.

The spelling of 81589650974 in words is "eighty-one billion, five hundred eighty-nine million, six hundred fifty thousand, nine hundred seventy-four".