66475427602 has 4 divisors (see below), whose sum is σ = 99713141406. Its totient is φ = 33237713800.

The previous prime is 66475427581. The next prime is 66475427633. The reversal of 66475427602 is 20672457466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20672457466 = 2 ⋅10336228733.

It can be written as a sum of positive squares in only one way, i.e., 65500676761 + 974750841 = 255931^2 + 31221^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16618856899 + ... + 16618856902.

Almost surely, 2^66475427602 is an apocalyptic number.

66475427602 is a deficient number, since it is larger than the sum of its proper divisors (33237713804).

66475427602 is a wasteful number, since it uses less digits than its factorization.

66475427602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33237713803.

The product of its (nonzero) digits is 3386880, while the sum is 49.

The spelling of 66475427602 in words is "sixty-six billion, four hundred seventy-five million, four hundred twenty-seven thousand, six hundred two".