1561722675320 has 32 divisors (see below), whose sum is σ = 3698816864400. Its totient is φ = 591810697728.

The previous prime is 1561722675299. The next prime is 1561722675323. The reversal of 1561722675320 is 235762271651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561722675323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1027448369 + ... + 1027449888.

Almost surely, 2^{1561722675320} is an apocalyptic number.

1561722675320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561722675320 is an abundant number, since it is smaller than the sum of its proper divisors (2137094189080).

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

1561722675320 is a wasteful number, since it uses less digits than its factorization.

1561722675320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054898287 (or 2054898283 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 1561722675320 in words is "one trillion, five hundred sixty-one billion, seven hundred twenty-two million, six hundred seventy-five thousand, three hundred twenty".