7466639861 has 2 divisors, whose sum is σ = 7466639862. Its totient is φ = 7466639860.

The previous prime is 7466639857. The next prime is 7466639879. The reversal of 7466639861 is 1689366647.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4611768100 + 2854871761 = 67910^2 + 53431^2 .

It is a cyclic number.

It is not a de Polignac number, because 7466639861 - 2² = 7466639857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7466639797 and 7466639806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7466639561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3733319930 + 3733319931.

It is an arithmetic number, because the mean of its divisors is an integer number (3733319931).

Almost surely, 2^7466639861 is an apocalyptic number.

It is an amenable number.

7466639861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7466639861 is an equidigital number, since it uses as much as digits as its factorization.

7466639861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 56.

The square root of 7466639861 is about 86409.7208709761. The cubic root of 7466639861 is about 1954.5272728853.

The spelling of 7466639861 in words is "seven billion, four hundred sixty-six million, six hundred thirty-nine thousand, eight hundred sixty-one".