1260117661 has 8 divisors (see below), whose sum is σ = 1378639584. Its totient is φ = 1142256720.

The previous prime is 1260117659. The next prime is 1260117671. The reversal of 1260117661 is 1667110621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1260117661 - 2¹ = 1260117659 is a prime.

It is a super-2 number, since 2×1260117661² = 3175793039128221842, 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 (1260117671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161250 + ... + 168883.

It is an arithmetic number, because the mean of its divisors is an integer number (172329948).

Almost surely, 2^1260117661 is an apocalyptic number.

1260117661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1260117661 is a deficient number, since it is larger than the sum of its proper divisors (118521923).

1260117661 is a wasteful number, since it uses less digits than its factorization.

1260117661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330491.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1260117661 is about 35498.1360214871. The cubic root of 1260117661 is about 1080.1159171991.

The spelling of 1260117661 in words is "one billion, two hundred sixty million, one hundred seventeen thousand, six hundred sixty-one".