25121691830 has 16 divisors (see below), whose sum is σ = 45229124304. Its totient is φ = 10046436960.

The previous prime is 25121691823. The next prime is 25121691839. The reversal of 25121691830 is 3819612152.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121691839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232481 + ... + 322940.

It is an arithmetic number, because the mean of its divisors is an integer number (2826820269).

Almost surely, 2^25121691830 is an apocalyptic number.

25121691830 is a deficient number, since it is larger than the sum of its proper divisors (20107432474).

25121691830 is a wasteful number, since it uses less digits than its factorization.

25121691830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559951.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 25121691830 in words is "twenty-five billion, one hundred twenty-one million, six hundred ninety-one thousand, eight hundred thirty".