154721768042 has 4 divisors (see below), whose sum is σ = 232082652066. Its totient is φ = 77360884020.

The previous prime is 154721768011. The next prime is 154721768053. The reversal of 154721768042 is 240867127451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 83342493481 + 71379274561 = 288691^2 + 267169^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38680442009 + ... + 38680442012.

Almost surely, 2^154721768042 is an apocalyptic number.

154721768042 is a deficient number, since it is larger than the sum of its proper divisors (77360884024).

154721768042 is an equidigital number, since it uses as much as digits as its factorization.

154721768042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77360884023.

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 154721768042 in words is "one hundred fifty-four billion, seven hundred twenty-one million, seven hundred sixty-eight thousand, forty-two".