19956277890025 has 9 divisors (see below), whose sum is σ = 24745812280581. Its totient is φ = 15965004443040.

The previous prime is 19956277889969. The next prime is 19956277890037. The reversal of 19956277890025 is 52009877265991.

The square root of 19956277890025 is 4467245.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 109930044249 + 19846347845776 = 331557^2 + 4454924^2 .

It is not a de Polignac number, because 19956277890025 - 2¹⁷ = 19956277758953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21889501 + ... + 22782949.

Almost surely, 2^{19956277890025} is an apocalyptic number.

19956277890025 is the 4467245-th square number.

19956277890025 is the 2233623-rd centered octagonal number.

It is an amenable number.

19956277890025 is a deficient number, since it is larger than the sum of its proper divisors (4789534390556).

19956277890025 is an frugal number, since it uses more digits than its factorization.

19956277890025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786908 (or 893454 counting only the distinct ones).

The product of its (nonzero) digits is 171460800, while the sum is 70.

The spelling of 19956277890025 in words is "nineteen trillion, nine hundred fifty-six billion, two hundred seventy-seven million, eight hundred ninety thousand, twenty-five".