2151365481554 has 4 divisors (see below), whose sum is σ = 3227048222334. Its totient is φ = 1075682740776.

The previous prime is 2151365481541. The next prime is 2151365481557. The reversal of 2151365481554 is 4551845631512.

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

It can be written as a sum of positive squares in only one way, i.e., 1939549226329 + 211816255225 = 1392677^2 + 460235^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2151365481557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537841370387 + ... + 537841370390.

Almost surely, 2^{2151365481554} is an apocalyptic number.

2151365481554 is a deficient number, since it is larger than the sum of its proper divisors (1075682740780).

2151365481554 is a wasteful number, since it uses less digits than its factorization.

2151365481554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075682740779.

The product of its digits is 2880000, while the sum is 50.

The spelling of 2151365481554 in words is "two trillion, one hundred fifty-one billion, three hundred sixty-five million, four hundred eighty-one thousand, five hundred fifty-four".