36181451520 has 144 divisors (see below), whose sum is σ = 128394023520. Its totient is φ = 9648377856.

The previous prime is 36181451497. The next prime is 36181451531. The reversal of 36181451520 is 2515418163.

36181451520 is a `hidden beast` number, since 3 + 6 + 1 + 81 + 4 + 51 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×36181451520² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 488899 + ... + 558018.

Almost surely, 2^36181451520 is an apocalyptic number.

36181451520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

36181451520 is an abundant number, since it is smaller than the sum of its proper divisors (92212572000).

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

36181451520 is a wasteful number, since it uses less digits than its factorization.

36181451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046947 (or 1046927 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

Adding to 36181451520 its reverse (2515418163), we get a palindrome (38696869683).

The spelling of 36181451520 in words is "thirty-six billion, one hundred eighty-one million, four hundred fifty-one thousand, five hundred twenty".