61474145520 has 160 divisors (see below), whose sum is σ = 193734171648. Its totient is φ = 16121723904.

The previous prime is 61474145501. The next prime is 61474145527. The reversal of 61474145520 is 2554147416.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61474145527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10883337 + ... + 10888983.

Almost surely, 2^61474145520 is an apocalyptic number.

61474145520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61474145520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96867085824).

61474145520 is an abundant number, since it is smaller than the sum of its proper divisors (132260026128).

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

61474145520 is a wasteful number, since it uses less digits than its factorization.

61474145520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6407 (or 6401 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The spelling of 61474145520 in words is "sixty-one billion, four hundred seventy-four million, one hundred forty-five thousand, five hundred twenty".