1661077763 has 4 divisors (see below), whose sum is σ = 1688308608. Its totient is φ = 1633846920.

The previous prime is 1661077757. The next prime is 1661077771. The reversal of 1661077763 is 3677701661.

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

It is a cyclic number.

It is not a de Polignac number, because 1661077763 - 2⁸ = 1661077507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661077703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13615331 + ... + 13615452.

It is an arithmetic number, because the mean of its divisors is an integer number (422077152).

Almost surely, 2^1661077763 is an apocalyptic number.

1661077763 is a deficient number, since it is larger than the sum of its proper divisors (27230845).

1661077763 is an equidigital number, since it uses as much as digits as its factorization.

1661077763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27230844.

The product of its (nonzero) digits is 222264, while the sum is 44.

The square root of 1661077763 is about 40756.3217550357. The cubic root of 1661077763 is about 1184.3043417611.

The spelling of 1661077763 in words is "one billion, six hundred sixty-one million, seventy-seven thousand, seven hundred sixty-three".