6155780998 has 4 divisors (see below), whose sum is σ = 9233671500. Its totient is φ = 3077890498.

The previous prime is 6155780957. The next prime is 6155781017. The reversal of 6155780998 is 8990875516.

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

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1538945248 + ... + 1538945251.

It is an arithmetic number, because the mean of its divisors is an integer number (2308417875).

Almost surely, 2^6155780998 is an apocalyptic number.

6155780998 is a deficient number, since it is larger than the sum of its proper divisors (3077890502).

6155780998 is a wasteful number, since it uses less digits than its factorization.

6155780998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077890501.

The product of its (nonzero) digits is 5443200, while the sum is 58.

The square root of 6155780998 is about 78458.7853461931. The cubic root of 6155780998 is about 1832.7126896252.

The spelling of 6155780998 in words is "six billion, one hundred fifty-five million, seven hundred eighty thousand, nine hundred ninety-eight".