661422534 has 32 divisors (see below), whose sum is σ = 1338764544. Its totient is φ = 217831200.

The previous prime is 661422529. The next prime is 661422557. The reversal of 661422534 is 435224166.

It is a junction number, because it is equal to n+sod(n) for n = 661422495 and 661422504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346984 + ... + 348884.

It is an arithmetic number, because the mean of its divisors is an integer number (41836392).

Almost surely, 2^661422534 is an apocalyptic number.

661422534 is an abundant number, since it is smaller than the sum of its proper divisors (677342010).

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

661422534 is a wasteful number, since it uses less digits than its factorization.

661422534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572.

The product of its digits is 34560, while the sum is 33.

The square root of 661422534 is about 25718.1362855087. The cubic root of 661422534 is about 871.2838463564.

The spelling of 661422534 in words is "six hundred sixty-one million, four hundred twenty-two thousand, five hundred thirty-four".