761743661 has 24 divisors (see below), whose sum is σ = 904477824. Its totient is φ = 641355120.

The previous prime is 761743651. The next prime is 761743663. The reversal of 761743661 is 166347167.

It is not a de Polignac number, because 761743661 - 2⁶ = 761743597 is a prime.

It is a Duffinian number.

It is an enlightened number because it begins with the concatenation of its prime factors (761743).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (761743663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1024856 + ... + 1025598.

It is an arithmetic number, because the mean of its divisors is an integer number (37686576).

Almost surely, 2^761743661 is an apocalyptic number.

It is an amenable number.

761743661 is a deficient number, since it is larger than the sum of its proper divisors (142734163).

761743661 is an frugal number, since it uses more digits than its factorization.

761743661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839 (or 811 counting only the distinct ones).

The product of its digits is 127008, while the sum is 41.

The square root of 761743661 is about 27599.7040020360. The cubic root of 761743661 is about 913.2779023877.

The spelling of 761743661 in words is "seven hundred sixty-one million, seven hundred forty-three thousand, six hundred sixty-one".