1561964055 has 16 divisors (see below), whose sum is σ = 2508370944. Its totient is φ = 829971360.

The previous prime is 1561964039. The next prime is 1561964059. The reversal of 1561964055 is 5504691651.

It is not a de Polignac number, because 1561964055 - 2⁴ = 1561964039 is a prime.

It is a super-2 number, since 2×1561964055² = 4879463418224086050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1561963998 and 1561964016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561964059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188059 + ... + 196188.

It is an arithmetic number, because the mean of its divisors is an integer number (156773184).

Almost surely, 2^1561964055 is an apocalyptic number.

1561964055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561964055 is a deficient number, since it is larger than the sum of its proper divisors (946406889).

1561964055 is a wasteful number, since it uses less digits than its factorization.

1561964055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384526.

The product of its (nonzero) digits is 162000, while the sum is 42.

The square root of 1561964055 is about 39521.6909430758. The cubic root of 1561964055 is about 1160.2645192936.

The spelling of 1561964055 in words is "one billion, five hundred sixty-one million, nine hundred sixty-four thousand, fifty-five".