1642609745 has 32 divisors (see below), whose sum is σ = 2369323008. Its totient is φ = 1068838848.

The previous prime is 1642609739. The next prime is 1642609777. The reversal of 1642609745 is 5479062461.

It is not a de Polignac number, because 1642609745 - 2⁶ = 1642609681 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1642609696 and 1642609705.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94202 + ... + 110268.

It is an arithmetic number, because the mean of its divisors is an integer number (74041344).

Almost surely, 2^1642609745 is an apocalyptic number.

It is an amenable number.

1642609745 is a deficient number, since it is larger than the sum of its proper divisors (726713263).

1642609745 is a wasteful number, since it uses less digits than its factorization.

1642609745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16229.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 1642609745 is about 40529.1221839309. The cubic root of 1642609745 is about 1179.8989056837.

The spelling of 1642609745 in words is "one billion, six hundred forty-two million, six hundred nine thousand, seven hundred forty-five".