661151022 has 64 divisors (see below), whose sum is σ = 1556236800. Its totient is φ = 187162752.

The previous prime is 661151017. The next prime is 661151041. The reversal of 661151022 is 220151166.

It is a junction number, because it is equal to n+sod(n) for n = 661150983 and 661151001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231133 + ... + 233975.

It is an arithmetic number, because the mean of its divisors is an integer number (24316200).

Almost surely, 2^661151022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661151022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778118400).

661151022 is an abundant number, since it is smaller than the sum of its proper divisors (895085778).

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

661151022 is a wasteful number, since it uses less digits than its factorization.

661151022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982 (or 2968 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 661151022 is about 25712.8571341265. The cubic root of 661151022 is about 871.1646102229.

The spelling of 661151022 in words is "six hundred sixty-one million, one hundred fifty-one thousand, twenty-two".