1616433957 has 6 divisors (see below), whose sum is σ = 2334849062. Its totient is φ = 1077622632.

The previous prime is 1616433947. The next prime is 1616433991. The reversal of 1616433957 is 7593346161.

It is a happy number.

1616433957 is a `hidden beast` number, since 161 + 6 + 433 + 9 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1559144196 + 57289761 = 39486^2 + 7569^2 .

It is not a de Polignac number, because 1616433957 - 2⁷ = 1616433829 is a prime.

It is a super-2 number, since 2×1616433957² = 5225717474685355698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616433947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89801878 + ... + 89801895.

Almost surely, 2^1616433957 is an apocalyptic number.

It is an amenable number.

1616433957 is a deficient number, since it is larger than the sum of its proper divisors (718415105).

1616433957 is a wasteful number, since it uses less digits than its factorization.

1616433957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179603779 (or 179603776 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 1616433957 is about 40204.8996640957. The cubic root of 1616433957 is about 1173.5978946639.

It can be divided in two parts, 161643 and 3957, that added together give a triangular number (165600 = T₅₇₅).

The spelling of 1616433957 in words is "one billion, six hundred sixteen million, four hundred thirty-three thousand, nine hundred fifty-seven".