403091661025 has 27 divisors (see below), whose sum is σ = 511901374329. Its totient is φ = 314867286720.

The previous prime is 403091661023. The next prime is 403091661047. The reversal of 403091661025 is 520166190304.

The square root of 403091661025 is 634895.

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 15625250001 + 387466411024 = 125001^2 + 622468^2 .

It is not a de Polignac number, because 403091661025 - 2¹ = 403091661023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403091661023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 136500949 + ... + 136503901.

Almost surely, 2^403091661025 is an apocalyptic number.

403091661025 is the 634895-th square number.

403091661025 is the 317448-th centered octagonal number.

It is an amenable number.

403091661025 is a deficient number, since it is larger than the sum of its proper divisors (108809713304).

403091661025 is an frugal number, since it uses more digits than its factorization.

403091661025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6002 (or 3001 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 403091661025 in words is "four hundred three billion, ninety-one million, six hundred sixty-one thousand, twenty-five".