123545551343440 has 40 divisors (see below), whose sum is σ = 287245844205408. Its totient is φ = 49417801211520.

The previous prime is 123545551343281. The next prime is 123545551343441. The reversal of 123545551343440 is 44343155545321.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123545551343441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3021979 + ... + 16006981.

Almost surely, 2^{123545551343440} is an apocalyptic number.

123545551343440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123545551343440 is an abundant number, since it is smaller than the sum of its proper divisors (163700292861968).

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

123545551343440 is a wasteful number, since it uses less digits than its factorization.

123545551343440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13103947 (or 13103941 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 49.

The spelling of 123545551343440 in words is "one hundred twenty-three trillion, five hundred forty-five billion, five hundred fifty-one million, three hundred forty-three thousand, four hundred forty".