661434001056 has 36 divisors (see below), whose sum is σ = 1880952941322. Its totient is φ = 220478000256.

The previous prime is 661434001009. The next prime is 661434001103. The reversal of 661434001056 is 650100434166.

It is a happy number.

661434001056 is a `hidden beast` number, since 6 + 6 + 143 + 400 + 105 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (661434001009) and next prime (661434001103).

It can be written as a sum of positive squares in only one way, i.e., 555233619600 + 106200381456 = 745140^2 + 325884^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 661434001056.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1148322631 + ... + 1148323206.

Almost surely, 2^661434001056 is an apocalyptic number.

It is an amenable number.

661434001056 is an abundant number, since it is smaller than the sum of its proper divisors (1219518940266).

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

661434001056 is a wasteful number, since it uses less digits than its factorization.

661434001056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296645853 (or 2296645842 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 661434001056 in words is "six hundred sixty-one billion, four hundred thirty-four million, one thousand, fifty-six".