191434757640025 has 45 divisors (see below), whose sum is σ = 248216471036863. Its totient is φ = 146461201792400.

The previous prime is 191434757639999. The next prime is 191434757640043. The reversal of 191434757640025 is 520046757434191.

The square root of 191434757640025 is 13835995.

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

It can be written as a sum of positive squares in only one way, i.e., 68916512750409 + 122518244889616 = 8301597^2 + 11068796^2 .

It is not a de Polignac number, because 191434757640025 - 2¹⁵ = 191434757607257 is a prime.

It is a super-2 number, since 2×191434757640025² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 36596204160 + ... + 36596209390.

Almost surely, 2^{191434757640025} is an apocalyptic number.

191434757640025 is the 13835995-th square number.

191434757640025 is the 6917998-th centered octagonal number.

It is an amenable number.

191434757640025 is a deficient number, since it is larger than the sum of its proper divisors (56781713396838).

191434757640025 is an frugal number, since it uses more digits than its factorization.

191434757640025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10564 (or 5259 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 58.

The spelling of 191434757640025 in words is "one hundred ninety-one trillion, four hundred thirty-four billion, seven hundred fifty-seven million, six hundred forty thousand, twenty-five".