511401642544551 has 64 divisors (see below), whose sum is σ = 753297514997760. Its totient is φ = 306024848400000.

The previous prime is 511401642544517. The next prime is 511401642544553. The reversal of 511401642544551 is 155445246104115.

It is a happy number.

It is not a de Polignac number, because 511401642544551 - 2¹³ = 511401642536359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 511401642544551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511401642544553) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1911998376 + ... + 1912265826.

It is an arithmetic number, because the mean of its divisors is an integer number (11770273671840).

Almost surely, 2^{511401642544551} is an apocalyptic number.

511401642544551 is a deficient number, since it is larger than the sum of its proper divisors (241895872453209).

511401642544551 is a wasteful number, since it uses less digits than its factorization.

511401642544551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269148.

The product of its (nonzero) digits is 1920000, while the sum is 48.

Adding to 511401642544551 its reverse (155445246104115), we get a palindrome (666846888648666).

The spelling of 511401642544551 in words is "five hundred eleven trillion, four hundred one billion, six hundred forty-two million, five hundred forty-four thousand, five hundred fifty-one".