123901378550 has 24 divisors (see below), whose sum is σ = 232215786792. Its totient is φ = 49182224000.

The previous prime is 123901378537. The next prime is 123901378567. The reversal of 123901378550 is 55873109321.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9451571 + ... + 9464670.

It is an arithmetic number, because the mean of its divisors is an integer number (9675657783).

Almost surely, 2^123901378550 is an apocalyptic number.

123901378550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123901378550 is a deficient number, since it is larger than the sum of its proper divisors (108314408242).

123901378550 is a wasteful number, since it uses less digits than its factorization.

123901378550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18916384 (or 18916379 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 123901378550 in words is "one hundred twenty-three billion, nine hundred one million, three hundred seventy-eight thousand, five hundred fifty".