1951661165167 has 32 divisors (see below), whose sum is σ = 2486374894080. Its totient is φ = 1491342243840.

The previous prime is 1951661165057. The next prime is 1951661165177. The reversal of 1951661165167 is 7615611661591.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1951661165167 - 2⁷ = 1951661165039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951661165177) 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, 14586948 + ... + 14720134.

It is an arithmetic number, because the mean of its divisors is an integer number (77699215440).

Almost surely, 2^{1951661165167} is an apocalyptic number.

1951661165167 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1951661165167 is a deficient number, since it is larger than the sum of its proper divisors (534713728913).

1951661165167 is a wasteful number, since it uses less digits than its factorization.

1951661165167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139711.

The product of its digits is 2041200, while the sum is 55.

The spelling of 1951661165167 in words is "one trillion, nine hundred fifty-one billion, six hundred sixty-one million, one hundred sixty-five thousand, one hundred sixty-seven".