1555201400643 has 24 divisors (see below), whose sum is σ = 2579600412480. Its totient is φ = 892938602160.

The previous prime is 1555201400633. The next prime is 1555201400713. The reversal of 1555201400643 is 3460041025551.

1555201400643 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 2 + 0 + 1 + 4 + 0 + 0 + 643 = 666.

It is not a de Polignac number, because 1555201400643 - 2²¹ = 1555199303491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1555201400598 and 1555201400607.

It is not an unprimeable number, because it can be changed into a prime (1555201400633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 413395621 + ... + 413399382.

It is an arithmetic number, because the mean of its divisors is an integer number (107483350520).

Almost surely, 2^{1555201400643} is an apocalyptic number.

1555201400643 is a deficient number, since it is larger than the sum of its proper divisors (1024399011837).

1555201400643 is a wasteful number, since it uses less digits than its factorization.

1555201400643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826795039 (or 826795036 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 1555201400643 in words is "one trillion, five hundred fifty-five billion, two hundred one million, four hundred thousand, six hundred forty-three".