20181651265 has 16 divisors (see below), whose sum is σ = 24274169856. Its totient is φ = 16107912000.

The previous prime is 20181651253. The next prime is 20181651271. The reversal of 20181651265 is 56215618102.

It is not a de Polignac number, because 20181651265 - 2⁷ = 20181651137 is a prime.

It is a super-2 number, since 2×20181651265² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4734235 + ... + 4738495.

It is an arithmetic number, because the mean of its divisors is an integer number (1517135616).

Almost surely, 2^20181651265 is an apocalyptic number.

It is an amenable number.

20181651265 is a deficient number, since it is larger than the sum of its proper divisors (4092518591).

20181651265 is a wasteful number, since it uses less digits than its factorization.

20181651265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 20181651265 in words is "twenty billion, one hundred eighty-one million, six hundred fifty-one thousand, two hundred sixty-five".