1661562054 has 48 divisors (see below), whose sum is σ = 3698549712. Its totient is φ = 538804224.

The previous prime is 1661562041. The next prime is 1661562079. The reversal of 1661562054 is 4502651661.

1661562054 is a `hidden beast` number, since 16 + 6 + 15 + 620 + 5 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194742 + ... + 203094.

It is an arithmetic number, because the mean of its divisors is an integer number (77053119).

Almost surely, 2^1661562054 is an apocalyptic number.

1661562054 is an abundant number, since it is smaller than the sum of its proper divisors (2036987658).

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

1661562054 is a wasteful number, since it uses less digits than its factorization.

1661562054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8661 (or 8658 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1661562054 is about 40762.2626212039. The cubic root of 1661562054 is about 1184.4194261190.

The spelling of 1661562054 in words is "one billion, six hundred sixty-one million, five hundred sixty-two thousand, fifty-four".