1696578649 has 16 divisors (see below), whose sum is σ = 1767149568. Its totient is φ = 1627480512.

The previous prime is 1696578643. The next prime is 1696578661. The reversal of 1696578649 is 9468756961.

It is a cyclic number.

It is not a de Polignac number, because 1696578649 - 2⁵ = 1696578617 is a prime.

It is a super-2 number, since 2×1696578649² = 5756758224485330402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1696578643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811884 + ... + 813970.

It is an arithmetic number, because the mean of its divisors is an integer number (110446848).

Almost surely, 2^1696578649 is an apocalyptic number.

It is an amenable number.

1696578649 is a deficient number, since it is larger than the sum of its proper divisors (70570919).

1696578649 is a wasteful number, since it uses less digits than its factorization.

1696578649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424.

The product of its digits is 19595520, while the sum is 61.

The square root of 1696578649 is about 41189.5453847211. The cubic root of 1696578649 is about 1192.6820022625.

The spelling of 1696578649 in words is "one billion, six hundred ninety-six million, five hundred seventy-eight thousand, six hundred forty-nine".