1561200064 has 28 divisors (see below), whose sum is σ = 3108989464. Its totient is φ = 777832704.

The previous prime is 1561200029. The next prime is 1561200071. The reversal of 1561200064 is 4600021651.

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, 24987 + ... + 61210.

It is an arithmetic number, because the mean of its divisors is an integer number (111035338).

Almost surely, 2^1561200064 is an apocalyptic number.

It is an amenable number.

1561200064 is a deficient number, since it is larger than the sum of its proper divisors (1547789400).

1561200064 is an equidigital number, since it uses as much as digits as its factorization.

1561200064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86492 (or 86482 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1561200064 is about 39512.0242964088. The cubic root of 1561200064 is about 1160.0753181377.

The spelling of 1561200064 in words is "one billion, five hundred sixty-one million, two hundred thousand, sixty-four".