155343421640 has 64 divisors (see below), whose sum is σ = 401365800000. Its totient is φ = 53515434240.

The previous prime is 155343421631. The next prime is 155343421643. The reversal of 155343421640 is 46124343551.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 155343421594 and 155343421603.

It is not an unprimeable number, because it can be changed into a prime (155343421643) 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, 9282515 + ... + 9299234.

It is an arithmetic number, because the mean of its divisors is an integer number (6271340625).

Almost surely, 2^155343421640 is an apocalyptic number.

155343421640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155343421640 is an abundant number, since it is smaller than the sum of its proper divisors (246022378360).

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

155343421640 is a wasteful number, since it uses less digits than its factorization.

155343421640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18581790 (or 18581786 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 155343421640 in words is "one hundred fifty-five billion, three hundred forty-three million, four hundred twenty-one thousand, six hundred forty".