561155670 has 48 divisors (see below), whose sum is σ = 1474068960. Its totient is φ = 148096512.

The previous prime is 561155657. The next prime is 561155677. The reversal of 561155670 is 76551165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561155677) 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, 23410 + ... + 40869.

It is an arithmetic number, because the mean of its divisors is an integer number (30709770).

Almost surely, 2^561155670 is an apocalyptic number.

561155670 is an abundant number, since it is smaller than the sum of its proper divisors (912913290).

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

561155670 is a wasteful number, since it uses less digits than its factorization.

561155670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64389 (or 64386 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 561155670 is about 23688.7245329925. The cubic root of 561155670 is about 824.8236758162.

The spelling of 561155670 in words is "five hundred sixty-one million, one hundred fifty-five thousand, six hundred seventy".