7940475465661 has 4 divisors (see below), whose sum is σ = 7940482994524. Its totient is φ = 7940467936800.

The previous prime is 7940475465613. The next prime is 7940475465679. The reversal of 7940475465661 is 1665645740497.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4794041620900 + 3146433844761 = 2189530^2 + 1773819^2 .

It is a cyclic number.

It is not a de Polignac number, because 7940475465661 - 2³⁷ = 7803036512189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7940475465593 and 7940475465602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7940475495661) 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, 1861920 + ... + 4398601.

It is an arithmetic number, because the mean of its divisors is an integer number (1985120748631).

Almost surely, 2^{7940475465661} is an apocalyptic number.

It is an amenable number.

7940475465661 is a deficient number, since it is larger than the sum of its proper divisors (7528863).

7940475465661 is a wasteful number, since it uses less digits than its factorization.

7940475465661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528862.

The product of its (nonzero) digits is 152409600, while the sum is 64.

The spelling of 7940475465661 in words is "seven trillion, nine hundred forty billion, four hundred seventy-five million, four hundred sixty-five thousand, six hundred sixty-one".