9957543658 has 4 divisors (see below), whose sum is σ = 14936315490. Its totient is φ = 4978771828.

The previous prime is 9957543623. The next prime is 9957543689. The reversal of 9957543658 is 8563457599.

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

It can be written as a sum of positive squares in only one way, i.e., 9760056849 + 197486809 = 98793^2 + 14053^2 .

It is a junction number, because it is equal to n+sod(n) for n = 9957543596 and 9957543605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2489385913 + ... + 2489385916.

Almost surely, 2^9957543658 is an apocalyptic number.

9957543658 is a deficient number, since it is larger than the sum of its proper divisors (4978771832).

9957543658 is a wasteful number, since it uses less digits than its factorization.

9957543658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978771831.

The product of its digits is 40824000, while the sum is 61.

The square root of 9957543658 is about 99787.4924927969. The cubic root of 9957543658 is about 2151.3813843395.

The spelling of 9957543658 in words is "nine billion, nine hundred fifty-seven million, five hundred forty-three thousand, six hundred fifty-eight".