79561187550 has 192 divisors, whose sum is σ = 236532360960. Its totient is φ = 19548397440.

The previous prime is 79561187549. The next prime is 79561187557. The reversal of 79561187550 is 5578116597.

It is a happy number.

79561187550 is a `hidden beast` number, since 7 + 9 + 5 + 6 + 1 + 1 + 87 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79561187557) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10297989 + ... + 10305711.

It is an arithmetic number, because the mean of its divisors is an integer number (1231939380).

Almost surely, 2^79561187550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79561187550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118266180480).

79561187550 is an abundant number, since it is smaller than the sum of its proper divisors (156971173410).

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

79561187550 is a wasteful number, since it uses less digits than its factorization.

79561187550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8344 (or 8333 counting only the distinct ones).

The product of its (nonzero) digits is 2646000, while the sum is 54.

The spelling of 79561187550 in words is "seventy-nine billion, five hundred sixty-one million, one hundred eighty-seven thousand, five hundred fifty".