381450218761 has 4 divisors (see below), whose sum is σ = 384362052624. Its totient is φ = 378538384900.

The previous prime is 381450218759. The next prime is 381450218791. The reversal of 381450218761 is 167812054183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 167812054183 = 307 ⋅546619069.

It is a cyclic number.

It is not a de Polignac number, because 381450218761 - 2¹ = 381450218759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381450218701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1455916735 + ... + 1455916996.

It is an arithmetic number, because the mean of its divisors is an integer number (96090513156).

Almost surely, 2^381450218761 is an apocalyptic number.

It is an amenable number.

381450218761 is a deficient number, since it is larger than the sum of its proper divisors (2911833863).

381450218761 is a wasteful number, since it uses less digits than its factorization.

381450218761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911833862.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 381450218761 in words is "three hundred eighty-one billion, four hundred fifty million, two hundred eighteen thousand, seven hundred sixty-one".