1551858684091 has 2 divisors, whose sum is σ = 1551858684092. Its totient is φ = 1551858684090.

The previous prime is 1551858684071. The next prime is 1551858684097. The reversal of 1551858684091 is 1904868581551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551858684091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1551858684097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775929342045 + 775929342046.

It is an arithmetic number, because the mean of its divisors is an integer number (775929342046).

Almost surely, 2^{1551858684091} is an apocalyptic number.

1551858684091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551858684091 is an equidigital number, since it uses as much as digits as its factorization.

1551858684091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824000, while the sum is 61.

The spelling of 1551858684091 in words is "one trillion, five hundred fifty-one billion, eight hundred fifty-eight million, six hundred eighty-four thousand, ninety-one".