1561550064 has 20 divisors (see below), whose sum is σ = 4034004456. Its totient is φ = 520516672.

The previous prime is 1561550009. The next prime is 1561550071. The reversal of 1561550064 is 4600551651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16266099 + ... + 16266194.

Almost surely, 2^1561550064 is an apocalyptic number.

It is an amenable number.

1561550064 is an abundant number, since it is smaller than the sum of its proper divisors (2472454392).

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

1561550064 is a wasteful number, since it uses less digits than its factorization.

1561550064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32532304 (or 32532298 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 1561550064 is about 39516.4530796983. The cubic root of 1561550064 is about 1160.1620027407.

The spelling of 1561550064 in words is "one billion, five hundred sixty-one million, five hundred fifty thousand, sixty-four".