123737661 has 12 divisors (see below), whose sum is σ = 180019840. Its totient is φ = 81897480.

The previous prime is 123737651. The next prime is 123737683. The reversal of 123737661 is 166737321.

It is not a de Polignac number, because 123737661 - 2⁶ = 123737597 is a prime.

It is a super-2 number, since 2×123737661² = 30622017499501842, 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 (123737641) 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 11 ways as a sum of consecutive naturals, for example, 48205 + ... + 50706.

Almost surely, 2^123737661 is an apocalyptic number.

It is an amenable number.

123737661 is a deficient number, since it is larger than the sum of its proper divisors (56282179).

123737661 is a wasteful number, since it uses less digits than its factorization.

123737661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99056 (or 99053 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 123737661 is about 11123.7431200114. The cubic root of 123737661 is about 498.3111835536.

The spelling of 123737661 in words is "one hundred twenty-three million, seven hundred thirty-seven thousand, six hundred sixty-one".