123471556540 has 48 divisors (see below), whose sum is σ = 263577162240. Its totient is φ = 48577886720.

The previous prime is 123471556499. The next prime is 123471556543. The reversal of 123471556540 is 45655174321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123471556543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158394 + ... + 521566.

It is an arithmetic number, because the mean of its divisors is an integer number (5491190880).

Almost surely, 2^123471556540 is an apocalyptic number.

123471556540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123471556540 is an abundant number, since it is smaller than the sum of its proper divisors (140105605700).

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

123471556540 is a wasteful number, since it uses less digits than its factorization.

123471556540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363462 (or 363460 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 43.

The spelling of 123471556540 in words is "one hundred twenty-three billion, four hundred seventy-one million, five hundred fifty-six thousand, five hundred forty".