153438032666 has 4 divisors (see below), whose sum is σ = 230157049002. Its totient is φ = 76719016332.

The previous prime is 153438032623. The next prime is 153438032669. The reversal of 153438032666 is 666230834351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666230834351 = 4751 ⋅140229601.

It can be written as a sum of positive squares in only one way, i.e., 120013052041 + 33424980625 = 346429^2 + 182825^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 153438032666.

It is not an unprimeable number, because it can be changed into a prime (153438032669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38359508165 + ... + 38359508168.

Almost surely, 2^153438032666 is an apocalyptic number.

153438032666 is a deficient number, since it is larger than the sum of its proper divisors (76719016336).

153438032666 is an equidigital number, since it uses as much as digits as its factorization.

153438032666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76719016335.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 153438032666 in words is "one hundred fifty-three billion, four hundred thirty-eight million, thirty-two thousand, six hundred sixty-six".