5991661995 has 32 divisors (see below), whose sum is σ = 10472315904. Its totient is φ = 2901120000.

The previous prime is 5991661993. The next prime is 5991661999.

5991661995 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 5991661995 - 2¹ = 5991661993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5991661993) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99739 + ... + 148091.

It is an arithmetic number, because the mean of its divisors is an integer number (327259872).

Almost surely, 2^5991661995 is an apocalyptic number.

5991661995 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

5991661995 is a deficient number, since it is larger than the sum of its proper divisors (4480653909).

5991661995 is a wasteful number, since it uses less digits than its factorization.

5991661995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49123.

The product of its digits is 5904900, while the sum is 60.

The square root of 5991661995 is about 77405.8266217731. The cubic root of 5991661995 is about 1816.2784714782.

The spelling of 5991661995 in words is "five billion, nine hundred ninety-one million, six hundred sixty-one thousand, nine hundred ninety-five".