43157985025 has 9 divisors (see below), whose sum is σ = 53517189481. Its totient is φ = 34525557040.

The previous prime is 43157985007. The next prime is 43157985061. The reversal of 43157985025 is 52058975134.

The square root of 43157985025 is 207745.

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 19609241089 + 23548743936 = 140033^2 + 153456^2 .

It is not a de Polignac number, because 43157985025 - 2⁵ = 43157984993 is a prime.

It is a super-2 number, since 2×43157985025² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43157985025.

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, 1017951 + ... + 1059499.

Almost surely, 2^43157985025 is an apocalyptic number.

43157985025 is the 207745-th square number.

43157985025 is the 103873-rd centered octagonal number.

It is an amenable number.

43157985025 is a deficient number, since it is larger than the sum of its proper divisors (10359204456).

43157985025 is an frugal number, since it uses more digits than its factorization.

43157985025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83108 (or 41554 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 49.

Multiplying 43157985025 by its sum of digits (49), we get a square (2114741266225 = 1454215²).

The spelling of 43157985025 in words is "forty-three billion, one hundred fifty-seven million, nine hundred eighty-five thousand, twenty-five".