61504157550 has 192 divisors, whose sum is σ = 168806695680. Its totient is φ = 14695296000.

The previous prime is 61504157549. The next prime is 61504157587. The reversal of 61504157550 is 5575140516.

It is a happy number.

It is a super-2 number, since 2×61504157550² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61504157499 and 61504157508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 72102924 + ... + 72103776.

It is an arithmetic number, because the mean of its divisors is an integer number (879201540).

Almost surely, 2^61504157550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61504157550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84403347840).

61504157550 is an abundant number, since it is smaller than the sum of its proper divisors (107302538130).

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

61504157550 is a wasteful number, since it uses less digits than its factorization.

61504157550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The spelling of 61504157550 in words is "sixty-one billion, five hundred four million, one hundred fifty-seven thousand, five hundred fifty".