2155614602381 has 2 divisors, whose sum is σ = 2155614602382. Its totient is φ = 2155614602380.

The previous prime is 2155614602353. The next prime is 2155614602429. The reversal of 2155614602381 is 1832064165512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1801957216900 + 353657385481 = 1342370^2 + 594691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155614602381 is a prime.

It is a super-2 number, since 2×2155614602381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155614602681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077807301190 + 1077807301191.

It is an arithmetic number, because the mean of its divisors is an integer number (1077807301191).

Almost surely, 2^{2155614602381} is an apocalyptic number.

It is an amenable number.

2155614602381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155614602381 is an equidigital number, since it uses as much as digits as its factorization.

2155614602381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 44.

Adding to 2155614602381 its reverse (1832064165512), we get a palindrome (3987678767893).

The spelling of 2155614602381 in words is "two trillion, one hundred fifty-five billion, six hundred fourteen million, six hundred two thousand, three hundred eighty-one".