1240610661 has 10 divisors (see below), whose sum is σ = 1853258022. Its totient is φ = 827073720.

The previous prime is 1240610653. The next prime is 1240610687. The reversal of 1240610661 is 1660160421.

1240610661 is a `hidden beast` number, since 1 + 2 + 40 + 610 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 665330436 + 575280225 = 25794^2 + 23985^2 .

It is not a de Polignac number, because 1240610661 - 2³ = 1240610653 is a prime.

It is a super-2 number, since 2×1240610661² = 3078229624373713842, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240610621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7658010 + ... + 7658171.

Almost surely, 2^1240610661 is an apocalyptic number.

It is an amenable number.

1240610661 is a deficient number, since it is larger than the sum of its proper divisors (612647361).

1240610661 is an equidigital number, since it uses as much as digits as its factorization.

1240610661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15316193 (or 15316184 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1240610661 is about 35222.3034595979. The cubic root of 1240610661 is about 1074.5134011191.

The spelling of 1240610661 in words is "one billion, two hundred forty million, six hundred ten thousand, six hundred sixty-one".