23139029550 has 192 divisors, whose sum is σ = 71684411904. Its totient is φ = 4809024000.

The previous prime is 23139029531. The next prime is 23139029561. The reversal of 23139029550 is 5592093132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23139029499 and 23139029508.

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, 901900 + ... + 927200.

It is an arithmetic number, because the mean of its divisors is an integer number (373356312).

Almost surely, 2^23139029550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23139029550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35842205952).

23139029550 is an abundant number, since it is smaller than the sum of its proper divisors (48545382354).

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

23139029550 is a wasteful number, since it uses less digits than its factorization.

23139029550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25403 (or 25398 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 39.

The spelling of 23139029550 in words is "twenty-three billion, one hundred thirty-nine million, twenty-nine thousand, five hundred fifty".