1670555651 has 4 divisors (see below), whose sum is σ = 1671766704. Its totient is φ = 1669344600.

The previous prime is 1670555629. The next prime is 1670555659. The reversal of 1670555651 is 1565550761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1670555651 - 2¹⁸ = 1670293507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1670555599 and 1670555608.

It is not an unprimeable number, because it can be changed into a prime (1670555659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603455 + ... + 606216.

It is an arithmetic number, because the mean of its divisors is an integer number (417941676).

Almost surely, 2^1670555651 is an apocalyptic number.

1670555651 is a deficient number, since it is larger than the sum of its proper divisors (1211053).

1670555651 is a wasteful number, since it uses less digits than its factorization.

1670555651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211052.

The product of its (nonzero) digits is 157500, while the sum is 41.

The square root of 1670555651 is about 40872.4314299994. The cubic root of 1670555651 is about 1186.5525653120.

The spelling of 1670555651 in words is "one billion, six hundred seventy million, five hundred fifty-five thousand, six hundred fifty-one".