2155641363642 has 32 divisors (see below), whose sum is σ = 4792691473920. Its totient is φ = 641878320960.

The previous prime is 2155641363599. The next prime is 2155641363691. The reversal of 2155641363642 is 2463631465512.

It is a junction number, because it is equal to n+sod(n) for n = 2155641363591 and 2155641363600.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445746417 + ... + 445751252.

It is an arithmetic number, because the mean of its divisors is an integer number (149771608560).

Almost surely, 2^{2155641363642} is an apocalyptic number.

2155641363642 is an abundant number, since it is smaller than the sum of its proper divisors (2637050110278).

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

2155641363642 is a wasteful number, since it uses less digits than its factorization.

2155641363642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891497718.

The product of its digits is 3110400, while the sum is 48.

The spelling of 2155641363642 in words is "two trillion, one hundred fifty-five billion, six hundred forty-one million, three hundred sixty-three thousand, six hundred forty-two".