61499243520 has 1760 divisors, whose sum is σ = 278630041536. Its totient is φ = 12740198400.

The previous prime is 61499243513. The next prime is 61499243551. The reversal of 61499243520 is 2534299416.

61499243520 is a `hidden beast` number, since 6 + 14 + 99 + 24 + 3 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (1760).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1008184290 + ... + 1008184350.

Almost surely, 2^61499243520 is an apocalyptic number.

61499243520 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 61499243520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139315020768).

61499243520 is an abundant number, since it is smaller than the sum of its proper divisors (217130798016).

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

61499243520 is a wasteful number, since it uses less digits than its factorization.

61499243520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 61499243520 in words is "sixty-one billion, four hundred ninety-nine million, two hundred forty-three thousand, five hundred twenty".