16920401025 has 36 divisors (see below), whose sum is σ = 30749465936. Its totient is φ = 8203826400.

The previous prime is 16920401021. The next prime is 16920401027. The reversal of 16920401025 is 52010402961.

It is not a de Polignac number, because 16920401025 - 2² = 16920401021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16920400983 and 16920401001.

It is not an unprimeable number, because it can be changed into a prime (16920401021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 923179 + ... + 941328.

Almost surely, 2^16920401025 is an apocalyptic number.

16920401025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16920401025 is a deficient number, since it is larger than the sum of its proper divisors (13829064911).

16920401025 is a wasteful number, since it uses less digits than its factorization.

16920401025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864542 (or 1864526 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 16920401025 its reverse (52010402961), we get a palindrome (68930803986).

The spelling of 16920401025 in words is "sixteen billion, nine hundred twenty million, four hundred one thousand, twenty-five".