2155540742 has 4 divisors (see below), whose sum is σ = 3233311116. Its totient is φ = 1077770370.

The previous prime is 2155540697. The next prime is 2155540753. The reversal of 2155540742 is 2470455512.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538885184 + ... + 538885187.

It is an arithmetic number, because the mean of its divisors is an integer number (808327779).

Almost surely, 2^2155540742 is an apocalyptic number.

2155540742 is a deficient number, since it is larger than the sum of its proper divisors (1077770374).

2155540742 is a wasteful number, since it uses less digits than its factorization.

2155540742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077770373.

The product of its (nonzero) digits is 56000, while the sum is 35.

The square root of 2155540742 is about 46427.8013909769. The cubic root of 2155540742 is about 1291.7706474479.

The spelling of 2155540742 in words is "two billion, one hundred fifty-five million, five hundred forty thousand, seven hundred forty-two".