81906906150 has 36 divisors (see below), whose sum is σ = 220056555732. Its totient is φ = 21841841520.

The previous prime is 81906906139. The next prime is 81906906161. The reversal of 81906906150 is 5160960918.

It is an interprime number because it is at equal distance from previous prime (81906906139) and next prime (81906906161).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 81906906096 and 81906906105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 91007224 + ... + 91008123.

Almost surely, 2^81906906150 is an apocalyptic number.

81906906150 is an abundant number, since it is smaller than the sum of its proper divisors (138149649582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81906906150 is a wasteful number, since it uses less digits than its factorization.

81906906150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182015365 (or 182015357 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 81906906150 in words is "eighty-one billion, nine hundred six million, nine hundred six thousand, one hundred fifty".