1618561277056 has 64 divisors (see below), whose sum is σ = 3279578868000. Its totient is φ = 795455051776.

The previous prime is 1618561276993. The next prime is 1618561277077. The reversal of 1618561277056 is 6507721658161.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1618561276988 and 1618561277006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102842820 + ... + 102858556.

Almost surely, 2^{1618561277056} is an apocalyptic number.

1618561277056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1618561277056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639789434000).

1618561277056 is an abundant number, since it is smaller than the sum of its proper divisors (1661017590944).

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

1618561277056 is a wasteful number, since it uses less digits than its factorization.

1618561277056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29429 (or 29417 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 55.

It can be divided in two parts, 16185 and 61277056, that added together give a square (61293241 = 7829²).

The spelling of 1618561277056 in words is "one trillion, six hundred eighteen billion, five hundred sixty-one million, two hundred seventy-seven thousand, fifty-six".