1625001665418 has 12 divisors (see below), whose sum is σ = 3520836941778. Its totient is φ = 541667221800.

The previous prime is 1625001665389. The next prime is 1625001665489. The reversal of 1625001665418 is 8145661005261.

1625001665418 is a `hidden beast` number, since 1 + 62 + 500 + 16 + 65 + 4 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1444676590809 + 180325074609 = 1201947^2 + 424647^2 .

It is a super-2 number, since 2×1625001665418² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45138935133 + ... + 45138935168.

Almost surely, 2^{1625001665418} is an apocalyptic number.

1625001665418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1625001665418 is an abundant number, since it is smaller than the sum of its proper divisors (1895835276360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1625001665418 is a wasteful number, since it uses less digits than its factorization.

1625001665418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90277870309 (or 90277870306 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 1625001665418 in words is "one trillion, six hundred twenty-five billion, one million, six hundred sixty-five thousand, four hundred eighteen".