8070020661 has 4 divisors (see below), whose sum is σ = 10760027552. Its totient is φ = 5380013772.

The previous prime is 8070020653. The next prime is 8070020669. The reversal of 8070020661 is 1660200708.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8070020653) and next prime (8070020669).

It is not a de Polignac number, because 8070020661 - 2³ = 8070020653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8070020669) 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, 1345003441 + ... + 1345003446.

It is an arithmetic number, because the mean of its divisors is an integer number (2690006888).

Almost surely, 2^8070020661 is an apocalyptic number.

It is an amenable number.

8070020661 is a deficient number, since it is larger than the sum of its proper divisors (2690006891).

8070020661 is a wasteful number, since it uses less digits than its factorization.

8070020661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690006890.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 8070020661 is about 89833.2937223166. The cubic root of 8070020661 is about 2005.8181134491.

The spelling of 8070020661 in words is "eight billion, seventy million, twenty thousand, six hundred sixty-one".